ACTA Pharmaceutica Sciencia 2009 , Vol 51 , Num 1
EFFECT OF SILYMARIN SUPPLEMENT ON THE PHARMACOKINETICS OF ORNIDAZOLE IN HEALTHY VOLUNTEERS
SRUNİVASA SURİ REPALLE, SHRAVAN KUMAR YAMSANİ, RAMESH GANNU, MADHUSUDAN RAO YAMSANİ
Centre for Biopharmaceutics and Pharmacokinetics, University College of Pharmaceutical Sciences, Kakatiya University, Warangal, Andhra Pradesh, India The objective of investigation was to study the influence of silymarin pretreatment on the pharmacokinetics of ornidazole in healthy human volunteers. A single oral dose of ornidazole (500 mg) tablet was administered to nine volunteers, either alone or after 9 days pretreatment with a daily dose of silymarin (140 mg) capsule after an overnight fasting. Blood samples were collected from antecubital vein for 48 h, and the serum concentration of ornidazole was determined using HPLC. Silymarin treatment resulted in the significant increase in AUC (0-), Cmax, and t1/2 by 30.25 %, 16.25 %, and 7.697 % respectively. Silymarin, a mixture of flavonolignans may alter the pharmacokinetics of ornidazole, probably by inhibiting the cytochrome P450 enzymes and p-glycoprotein. Keywords : SILYMARIN, ORNIDAZOLE, HEALTHY HUMAN VOLUNTEERS, PHARMACOKINETICS

Istanbul Medipol University